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concurrent-thread-js

v1.0.2

Published

为单线程的JavaScript实现多线程并发的功能,语意上参考Java实现,提供getState/sleep/join等API,并提供线程间通信的功能,依赖ES6语法,基于Promise和Async函数实现,故需要Babel编译才能运行

Downloads

3

Readme

concurrent-thread.js

为单线程的JavaScript实现多线程并发的功能,语意上参考Java实现,提供getState/sleep/join等API,并提供线程间通信的功能,依赖ES6语法,基于Promise和Async函数实现,故需要Babel编译才能运行。JavaScrpt本来就是单线程的,所以这只是在API的层面实现了模拟,在下文的介绍中,每条所谓的线程其实就是普通的异步函数,并在此基础上实现不同线程的协调配合

When to use

当工程需要让两个函数在执行上不互相干扰,同时也不希望它们会阻塞主线程,与此同时,这两个函数还需要实现类似并发多线程之间的协调需求的时候,你可以使用这个并发模拟库,~~实际上这种应用场景很少(扎心了呀)~~。

API

  • submit(function,[namespace]): 接收一个函数,普通函数或Async函数均可,并异步执行,线程
  • sleep(ms): 线程休眠,可指定休眠时间ms,以毫秒计算
  • join(threadName): 线程同步,调用此方法的线程函数将在threadName执行结束后继续执行
  • interupt(threadName): 线程中断,影响线程内部调this.isInterrupted()的返回值
  • Lock.lock: 加锁,一个时刻只能有一个线程函数进入临界区,其他线程函数需要等待,锁是非公平的,也就是说后面排队的线程函数没有先后,以随机的方式进行竞争。
  • Lock.unlock:解除非公平锁
  • Condition.wait:不具备执行条件,线程进入waiting状态,等待被唤醒
  • Condition.notify:随机唤醒一个wait的线程
  • Condition.notifyAll: ~~尚未编写~~,唤醒所有wait的线程
  • getState: ~~尚未编写~~ 获取线程状态,包括RUNNALE(运行),WAITING(等待),BLOCKED(阻塞),TERMINATED(终止)

Usage

submit

线程休眠

submit(async function example() {
    await this.sleep(3000);
    console.log(1);
});
// 3秒后输出 1

interupt

线程中断

submit(async function example() {
    console.log(this.isInterrupted());
    this.interrupt();
    console.log(this.isInterrupted());
});
// 输出 false 
// 输出 true

getState

获取线程状态

submit(async function example() {
    console.log(this.getState());
});
// 输出 RUNNABLE

Lock

非公平锁

  • Lock.lock: 加锁
  • Lock.unlock: 解锁
async function commonCode() {
    await Lock.lock();
    await Executor.sleep(3000);
    Lock.unLock();
}

submit(async function example1() {
    console.log('example1 start')
    await commonCode();
    console.log('example1 end')
});
submit(async function example2() {
    console.log('example2 start')
    await commonCode();
    console.log('example2 end')
});
// 立即输出
example1 start
example2 start
// 3秒后输出
example1 end
// 再3秒后输出
example2 end

Condition

条件对象

  • Condition.wait:不具备执行条件,线程进入waiting状态,等待被唤醒
  • Condition.notify: 唤醒线程
async function testCode() {
    console.log('i will be wait');
    if (true) {
        await Condition.wait();
    };
    console.log('i was notified ');
}

submit(async function example() {
    testCode();
    setTimeout(() => {
        Condition.notify();
    }, 3000);
});
i will be wait
// 3秒后输出
i was notified

dataMap/dataList

线程通信状态对象,分别为对象和数组